I don't know what happened, I was playing and got the eye surgery augmentations, but then I can no longer scavenge on hexes. Pressing E does nothing and pressing on the blue "Scavenge" button doesn't do anything either. And yes, this is on hexes with the magnifying glass icon.

I can't scavange too, but for me I got the reason, it's because of a crippeled left hand. Maybe one of your's limps crippeled too?

Just re-read your post again: You scavange button is still shown? Mine not, so there must be another reason.
But once I had something similar too, that means buttons didn't react as they should, then I just changed onto another screen, e.g. the crafting one. When going back to the map the buttons did react again. If not, is your problem still there after save&quit and reloading?

That's actually a known bug that the dev will be tackling as soon as he returns from the holidays. We're not sure yet what causes it. However, if you save, close and restart, it will go away, without endangering your save. If you still have problems after reloading, maybe you could let us know over at the official Bluebottlegames.com forums - responses are much faster there! :)

Yes, seems like that was the case because I was able to scavenge again after restarting, phew haha.